California Gov. Jerry Brown signed a tough new net neutrality bill into law Sunday, but the Justice Department promptly filed suit to keep the protections from taking effect.

Why it matters: The issue seems destined for the courts to decide between challenges to the FCC’s moves as well as the California law. In rolling back protections last year, the FCC included language designed to preempt new state laws.

The details: In its suit, the Justice Department also maintains that California’s law is an attempt to regulate interstate commerce, which is under federal purview.